Device for preventing false weft detection



Feb. 27, 1951 L. A. CARRON DEVICE FOR PREVENTING FALSE WEFT DETECTIONFiled Sept. 8, 1949 INVENTOR LEON. A. CARRON m 7? Y M ATTORNEY PatentedFeb. 27, 1951 OFFHQE DEVIE F018, PREVENTING FALSE WEFT DETECTION Leon A.Carron, Worcester, Mass, assignor to Crompton & Knowles Loom Works,Worcester, Mass, a corporation of Massachusetts Application September 8,1949, Serial No. 114,557

6 Claims. 1

This invention relates to improvements in electrically indicating sideslipping weft detectors for weft replenishing looms and it is thegeneral object of the invention to prevent the detector from giving afalse indication when it is moved forwardlv incident to a weftreplenshing operation of the loom.

Multicolor weft replenishing looms are generall" made with the weftdetector at the magazine end. This construction requires that thedetector be moved out of the path of the incoming bobbin at the time ofweft replenishment. When a weft detector of the side slipping type isemployed there is likelihood that the forward motion of the detectormade necessary to clear the path for the incoming bobbin may produce afalse indication of weft exhaustion.

It is an important object of the present invention to provide a locklever on the weft detector mechanism normally in non-locking position topermit the detector to perform its detecting function onnon-replenishing beats of the loom but so controlled as to move intolocking relation with respect to the detector when the latter is movedforwardly by the transferrer arm and thereby prevent a false indication.

With these and other objects in view which will appear as thedescription proceeds, the in-- vention resides in the combination andarrange ment of parts hereinafter described and set forth.

In the accompanying drawings, wherein a convenient embodiment of theinvention is set forth,

Fig. l is a side elevation of part of a weft repl nishing loom, the layand shuttle being in cross section and the weft detector being in normalposition,

Fig. 2 is an enlarged plan view looking in the direction of arrow 2,Fig. 1, the bolt which holds the detector to its carrier being insection,

V Fig. 3 is a view similar to Fig. z but showing the detector in itsforward p'ositionwith the locking lever moved to locking position, and

Fig. 4 is an enlarged detailed vertical section on line i i, Fig. 3.

Referring to Fig. 1, the loom frame iii supports the foot H of a weftreplenishing mechanism which includes in its construction a transferrerarm 52. The latteris pivotally mounted on a stud l3 secured to stand Hand has a depending foot i i provided with a laterally extending lug I5.

Secured to the stud E3 in stationary position is a stand i5 which holdsa support 5 l in stationary adjusted position. The support has a hub E3in which is-slidably mounted a rod 59 the forward guide rod 22 securedto the support ll.

and at its other end to the plate it.

2 end of which, at the left as viewed in Fig. 1, is secured to aU-shaped carrier 2d. The latter has an upstanding arm 2i through whichpasses a The carrier has a forward upright arm 23 to which is attachedthe forward end of a tension spring 24 the rear end of which is attachedas at 25 to a part of the support ii. The effect of spring 24 is to holda carrier 21! in rearward position, or to the right as viewed in Fig. l,but permit the carrier to slide forwardly on a replenishing beat of theloom. On such a beat the transferrer arm l2 will rock in a clockwisedirection around stud l3 and the lug 15 will engage the arm 23 and movethe carrier forwardly.

The weft detector mechanism, designated generally at D, comprises aplate 39 which may be made of sheet steel and supports at its rear end astud 3! on which is pivotally mounted a detector finger 32. The latterfinger has slidably mounted therein a detector wire 33 having a detectortip 3 for engagement with the bobbin in the shuttle. The tip 34 isnormally held in rear position but upon engagement with a full supply ofweft will slide forwardly in the finger 32 without causing angularmotion of the latter. When, however, the detector engages a depletedbobbin it will slide to the right and move to the dotted line positionshown in Fig. 2 against the action of a spring 35 which surrounds stud3i and is operatively connected at one end to the finger 32 Plate 30 isprovided with a back and forth extending slot 35 through which extends abolt 3? which secures the plate to the underside of carrier 28. Byloosening bolt 37 the weft detector can be adjusted rearwardly orforwardly relatively to carrier 2i and the support ll.

' Extending forwardly from the detector finger 32 is a switchcontrolling finger 59 for cooperation with a plunger 4! forming part ofan electric switch 32 secured to the under side of plate 30. The switchis so constructed that when the plunger is pushed in, or moved to theright as viewed in Fig. 2, the switch will be open, but when thedetector moves to indicating position, shown in dotted lines Fig. 2, thefinger 353 will move to the left, thereby permitting plunger ii to moveto the left to effect closure of a contact within the switch 42. Whenthis switch is closed a loom controlling circuit including electricwires 43 and 4 3 is closed to effect a change in loom operation, such asweft replenishment.

The matter thus far described may be of common construction and operatesin the usual manner. When the shuttle S in the shuttle box 45 is to bereplenished the transferrer arm 2! descends to push a new bobbin intothe shuttle, the old bobbin passing downwardly through a slot G in thelay 5?. At the same time the carrier 29, detector plate 30, and detectorfinger are moved forwardly by lug l5, and it is incident to this forwardmotion that the detector finger is likely to rock on its pivot stud SIand move finger so to the left, Fig. 2, and permit plunger ll to enableswitch 42 to givea false indication of weft exhaustion.

The object of the present invention is to provide means which wouldprevent the detector finger from having a false indication when it ismoved forwardly due to descent of the transferrer arm, and in carryingthe invention into effect .1 provide a lock lever 59 pivoted at itsright end as viewed in Fig. 2 to a stud or screw 5| fastened to andextending upwardly from the plate 30. A wing 52 is secured to the lever55! and extends upwardly therefrom for engagement with a positioningscrew 53 adjustable back and forth in the stationary support H. A spring55, shown in Fig. 2 as of the resilient wire type, has an end 65 thereofreceived by a groove '56 in the forward edge of the lever 59 to be heldin operative relation with respect to the lever. The spring eX- tendsdown through a perforation 51 in the plate and is then bent in the formof an eye 58 and held by the head '59 of a screw 68 tapped into theunder side plate 39. The effect of the spring is to urge lever 56in aclockwise direction as viewed in Fig. 2. Spring 55 is weaker than spring24 so that the latter is always ableto overpower the weaker spring andmaintain the detector in normal detecting position on non-re plenishingbeats of the loom.

Lever 59 is provided with a detector or notch ii to receive a lug 62 onthe forward part of finger or arm 42 when the lever is in lookingposition. The left side of notch 6|, Fi 2. is defined by a shoulder 63on lever 55!, and a stop wall 64 on the lever is at the front of thenotch.

Under normal conditions the parts will be in the position shown in Fig.2. lever 58 being held in forward non-locking posit-ion due to the factthat spring 2 while acting to maintain the detector in rear positioncauses the wing 52 to engage the stationary control member or screw 53and thus hold the lever 50 in open or non-locking position. as shown inFig. 2. On a weft replenisln ing beat of the loom, however, when plate30 moves forwardly as already described the lever 50 also movesforwardly, but the screw 53 remains stationary and as the pivot or stud5i advances the screw 53 becomes a fulcrum around which the lever canrock until lug 52 enters the notch 6| as shown in Fig. 3. The shoulder63is then at the left of lug Eland the detectorfinger cannot rock in adirection to give a false indication of weft exhaustion and the switch42 remains open. During continued forward motion of plate St! the locklever moves away from screw 53 and wall 64 by its engagement with thefront of lug 62 prevents further turning of the lever on plate 30.

As the lay moves rearwardly subsequent to a replenishing operation thespring 24 returnsthe detector to its normal position, and in doing socauses screw 53. to effect rocking of lever 50 relatively to plate 30 ina counter-clockwise direction around the pivot stud 5| and return thelever to its normal non-locking position shown in Fig. 2.

From the foregoing it will be seen that the invention sets forth simplemeans for preventing an electrical side slipping weft detector fromgiving a false indication by providing a lock lever normally innon-locking position when the detector is in rear position but moved tolocking position relatively to the detector finger when the'detectormechanism is moved forwardly by the transferrer arm. Lever 53 moves intolocking position incident to forward motion of plate 30 and noadditional mechanism is needed to effect movement of the lever tolocking position. Screw .53 can be adjusted to regulate the time oflooking of the detector finger should the plate 30 be adjusted'back orforth relatively to carrier 20 by means of bolt 36.

Having thus described the invention it will be seen that changes andmodifications of the foregoing specific disclosure may be made withoutdeparting'from the spirit and scope of the invention.

What is claimed as new is:

1. In weft detecting mechanism for a loom having a transferrer arm whichoperates on weft repleni hing beats of the loom, a weft detector movedforwardly by the transferrer arm on replenishing beats of the loom, aside slipping detector finger on the weft detector normally innonindioating position but tending to have a false side slippingindicating movement when the weft detector is moved forwardly by thetransferrer arm, a lock lever for said finger pivoted on the weftdetector, a stationary control member normally engaging said lever andpreventing "the latter from moving to locking position relatively to sad finger when the weft detector is in normal position, and resilientmeans tending to move the lock lever into locking position relative tosaid finger, said weft detector when moved by the transferrer arm movingthe lever relatively to said control member and said resilient meansthereupon moving 'the lever into locking relation with the finger toprevent the latter from having a false side slipping movement.

2. In an electrically indicating side slipping weft detector mechanismfor a loom having a transferrer arm which operates on weft replenishingbeats of the loom, a weft detector normally in detecting position butmoved from such position by the transferrer arm on a weft replenishingbeat of the loom, a detector finger pivoted on said weft detectornormally in nonindicating position but tending to move the indicatingposition when the weft detector is .moved by the transferrer arm, anelectric switch on said weft detector, an arm on said detectorfingernormally maintaining the switch open, a lock lever pivoted on said weftdetector moving with the latter and formed to have holding engagementwith the arm, a stationary control member engaging the lock lever andnormally maintaining the latterinnonlocking posi- -.'tion with respectto said arm, and means moving the lever into locking relation with saidarm when the weft detector is moved by the transferrer arm and moves thelock lever relatively to said stationary control member.

3. In weft detecting mechanism for a loom having a transferrer arm whichoperates on weft replenishing beats of the loom, a stationary support, acarrier. movable backwardly and forwardly 5 and finger and. the lattertending due to said movement to have a false side slipping motion, alock lever mounted for pivotal motion relative to the carrier and movingbaekwardly and forwardly therewith, a stationary control member normallyengaging the lock lever and holding the latter in nonlocking positionwith respect to said finger, and a spring normally urging the levertoward locking position and against said control member and exertingless' force than the 1 first named spring, said carrier when movedforwardly by the transferrer arm overpowering the first named spring andenabling the second spring to move the lock lever into locking relationwith respect to said finger to prevent the latter from having a falseside slipping motion.

4. In weft detecting mechanism for a weft replenishing loom, astationary support, a carrier movable backwardly and forwardlyrelatively to the support, a plate secured to said carrier, a sideslipping weft detector finger pivoted on the plate, a lock lever pivotedon the plate normally tending to move into locking position with respectto said finger, the carrier and plate and finger having a forwardmovement on weft replenishing beats of the loom and said finger tendingto have a false side slipping motion due to said movement, a stationarycontrol member for said lock lever adjustable backwardly and forwardlywith respect to said support and normally preventing said lever-frommoving into locking relation with said finger, and holding connectionsbetween the carrier and plate by which said carrier and plate areadjustable with respect to eachfother in a back and forth direction,said plate when having said forward movement moving said leverrelatively to said control member and enabling said pivoted thereon andhaving a lock lever pivoted thereon and supporting a spring normallytending to move the lock lever into locking relation with respect tosaid detector finger, said lever constructed to engage said controlmember and said plate constructed for attachment to said carrier.

6. In weft detecting mechanism for a weft replenishing loom, astationary control member, a weft detector having a forward movement onweft replenishing beats of the loom, a side slipping detector finger, apivotal connection between the finger and the weft detector, an arm onsaid finger extending forwardly from said pivotal connection, a locklever pivoted on the weft detector having a stop wall and a shoulder,and resilient means normally tending to move the lock lever into lockingrelation with respect to said arm but prevented from doing so by saidcontrol member, said weft detector when moving forwardly moving saidlock lever and detector finger forwardly relatively to said controlmember and said resilient means thereupon moving said stop wallrearwardly against said arm and moving said shoulder into position toprevent side slipping motion of the finger relatively to the weftdetector.

LEON A. CARRON.

No references cited.

